As rockfish season begins on Saturday, the new guidelines are based on the latest test results, state officials said.

Officials also give advice on the best ways to prepare rockfish to avoid contamination. Maryland Department of the Environment spokeswoman Dawn Stoltzfus said cutting out fatty sections where contaminants are highest can help reduce exposure.

The two main contaminants in rockfish are PCBs and methylmercury, according to the Department of the Environment.